Do creationists accept HeLa cells as a case of macro evolution?

source
http://en.wikipedia.org/wiki/HeLa#Helacyton_gartleri
HeLa cells or Helacyton gartleri are arguably a new species that evolved from humans. This is a case of macro evolution from a mammal to a ... well, i call it a microbe since it is single celled. Others are Canine transmissible venereal tumor and... show more source http://en.wikipedia.org/wiki/HeLa#Helacy...

HeLa cells or Helacyton gartleri are arguably a new species that evolved from humans. This is a case of macro evolution from a mammal to a ... well, i call it a microbe since it is single celled. Others are Canine transmissible venereal tumor and Devil facial tumour disease.

Its arguably a new species since there are so many mutations and obviously it can't reproduce with a human

lets set aside the "there is no such thing as macro or micro evolution only evolution" debate for a moment

I thought evolution only happened one step at a time? If that is the case, then why are there so many mutations? And aren't the 'evolutionary steps' supposed to be beneficial for that species? How is a disease beneficial?